A 15-year-old girl from Westbury has been arrested after making 30 hoax calls to Wiltshire Police.
Most of the calls contained abusive and threatening language and during one of them, another caller who was in a genuine emergency only had seconds to tell operators her address.
If the operator had been delayed in answering this call, the consequences could have been tragic.
Operational Policing Superintendent Gavin Williams said, "The time wasted on dealing with hoax calls can mean the difference between life and death for people genuinely trying to contact us."
Wiltshire Police take on average 250 999 calls each day, with only a handful of them being urgent.